You realize that this is a site full of entrepreneurs, who are here to talk about the business aspects of these links, right? If not, I'd recommend re-reading my comment in that light.
As a product company, having somebody actually on your website and interested in finding out about your thing is extremely valuable. It doesn't matter that it's technically possible to find a link to the homepage. The fact that it's not trivial, as in linked from the logo, is what we're discussing here.
If you have a blog about your product, every post needs to contain a way to ensnare random visitors who stumbled in from wherever. The ideal way to do this is a prominent sidebar or header with the product name, a 5-word description of what it does and why you need one, and a big shiny button labeled with your call to action.
That's the "product blogging 101" bit that I mentioned above. That's why these guys need to fix their blog. They're bleeding interested visitors, and that's a big deal.